ref: bfbe4803191725a24151ae04068a18cada3824e4
dir: /sys/src/cmd/python/Demo/sockets/unicast.py/
# Send UDP broadcast packets
MYPORT = 50000
import sys, time
from socket import *
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', 0))
while 1:
    data = repr(time.time()) + '\n'
    s.sendto(data, ('', MYPORT))
    time.sleep(2)